//===================================================================================
// Microsoft patterns & practices
// Composite Application Guidance for Windows Presentation Foundation and Silverlight
//===================================================================================
// Copyright (c) Microsoft Corporation.  All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===================================================================================
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious.  No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
//===================================================================================
using System;

namespace Microsoft.Practices.Prism
{
	/// <summary>
	/// Helper class for parsing <see cref="Uri"/> instances.
	/// </summary>
	public static class UriParsingHelper
	{
		/// <summary>
		/// Gets the query part of <paramref name="uri"/>.
		/// </summary>
		/// <param name="uri">The Uri.</param>
		public static string GetQuery(Uri uri)
		{
			return EnsureAbsolute(uri).Query;
		}

		/// <summary>
		/// Gets the AbsolutePath part of <paramref name="uri"/>.
		/// </summary>
		/// <param name="uri">The Uri.</param>
		public static string GetAbsolutePath(Uri uri)
		{
			return EnsureAbsolute(uri).AbsolutePath;
		}

		/// <summary>
		/// Parses the query of <paramref name="uri"/> into a dictionary.
		/// </summary>
		/// <param name="uri">The URI.</param>
		public static UriQuery ParseQuery(Uri uri)
		{
			var query = GetQuery(uri);

			return new UriQuery(query);
		}

		private static Uri EnsureAbsolute(Uri uri)
		{
			if (uri.IsAbsoluteUri)
			{
				return uri;
			}

			if ((uri != null) && !uri.OriginalString.StartsWith("/", StringComparison.Ordinal))
			{
				return new Uri("http://localhost/" + uri, UriKind.Absolute);
			}
			return new Uri("http://localhost" + uri, UriKind.Absolute);
		}
	}
}